Ultrafast dephasing of surface plasmon excitation in silver nanoparticles:: Influence of particle size, shape, and chemical surrounding -: art. no. 257404
Ultrafast dephasing of surface plasmon excitation in silver nanoparticles:: Influence of particle size, shape, and chemical surrounding -: art. no. 257404
复制标题
DOI：
10.1103/physrevlett.89.257404
复制
发表时间：
2002-12-16
影响因子：
8.6
通讯作者：
Tr채ger, F
中科院分区：
文献类型：
--
作者：
Bosbach, J;Hendrich, C;Tr채ger, F
通过两种特殊方法的结合，持续光谱烧孔和激光辅助纳米粒子制备，系统地研究了银纳米粒子表面等离子体激发的退相时间T-2。发现T-2对等离子体激元能量的强烈依赖性，这反映了带间阻尼的相关性，并且在测量T-2时需要精确控制颗粒形状。减少的尺寸上的失相动力学的影响，观察到作为减少的T-2与收缩的颗粒尺寸。此外，对于石英衬底上的银纳米颗粒，观察到相当数量的化学界面阻尼。
By combination of two special methods, i.e., persistent spectral hole burning and laser assisted nanoparticle preparation, the dephasing time T-2 of surface plasmon excitation in silver nanoparticles was systematically investigated. A strong dependence of T-2 on the plasmon energy is found which reflects the relevance of interband damping and makes necessary a precise control of the particle shape when measuring T-2. The influence of the reduced dimension on the dephasing dynamics was observed as a decrease of T-2 with shrinking particle size. In addition, for silver nanoparticles on quartz substrates, a considerable amount of chemical interface damping was observed.